To this end we express the pairing states in a configuration space in terms of time reversal \(\hat{T}\)  and parity \(\hat{P}\)  operations (not to be confused with \(T^*, P^*\) ). In the fully relativistic scenario, we must also take into account the charge conjugation symmetry \(\hat{C}\) . The charge conjugation operator comes into play to describe pairing terms involving anti-particles.
In terms of the Clifford algebra basis these operators take the form of [1]}


T = ı1 3  ,
